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Liu J, Zhao H, Hu S, Li N, Cui M, Han B, Li M, Zhang C. Covalent organic framework-based ratiometric electrochemical sensing platform for ultrasensitive determination of amyloid-β 42 oligomer. Talanta 2024; 280:126699. [PMID: 39142131 DOI: 10.1016/j.talanta.2024.126699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Revised: 07/12/2024] [Accepted: 08/10/2024] [Indexed: 08/16/2024]
Abstract
Accurate and sensitive detection of amyloid-β 42 oligomer (Aβ42O) is of great significance for early diagnosis of Alzheimer's disease (AD). Herein, a signal on-off ratiometric electrochemical immunosensor was developed for highly selective and quantitative determination of Aβ42O by using novel covalent organic frameworks (COFs) composites as the sensing platform. This immunosensor produced two independent electrochemical signals from the [Fe(CN)6]3-/4- and methylene blue (MB) probes at different potentials based on the electrocatalytic activity of gold nanoparticle-functionalized porphyrinyl COFs nanocomposites toward [Fe(CN)6]3-/4- and the signal probe of MB encapsulated in the aptamer-modified alkynyl COFs. Because the two signals of [Fe(CN)6]3-/4- and MB changed in opposite directions, a signal on-off mode was generated which can correct the results by introducing a reference signal and effectively eliminate background interference. Under optimal experimental conditions, the current ratio (IMB/I[Fe(CN)6]3-/4-) was well linearly related to the logarithmic value of Aβ42O concentrations in the range of 10 pM to 1 μM, and the detection limit was 5.1 pM (S/N = 3). Additionally, the immunosensor exhibited satisfactory performance in case of real cerebrospinal fluid samples. The designed ratiometric electrochemical immunosensor provides a valuable route for early diagnosis of AD and our results also pave the way for designing of sensing platforms using COF-based nanomaterials and extending their functions and applications to bioanalysis.
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Affiliation(s)
- Jingjie Liu
- Hebei Key Laboratory of Photoelectric Control on Surface and Interface, College of Science, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Haiyan Zhao
- Hebei Key Laboratory of Photoelectric Control on Surface and Interface, College of Science, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Shuyang Hu
- Hebei Key Laboratory of Photoelectric Control on Surface and Interface, College of Science, Hebei University of Science and Technology, Shijiazhuang, 050018, China; Key Laboratory of Innovative Drug Development and Evaluation, College of Pharmaceutical Sciences, Hebei Medical University, Shijiazhuang, 050017, China
| | - Na Li
- Hebei Key Laboratory of Photoelectric Control on Surface and Interface, College of Science, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Min Cui
- Hebei Key Laboratory of Photoelectric Control on Surface and Interface, College of Science, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Bingkai Han
- Tianjin Key Laboratory of Exercise Physiology and Sports Medicine, Institute of Sport, Exercise & Health, Tianjin University of Sport, Tianjin, 300381, China
| | - Meng Li
- Key Laboratory of Innovative Drug Development and Evaluation, College of Pharmaceutical Sciences, Hebei Medical University, Shijiazhuang, 050017, China.
| | - Cong Zhang
- Hebei Key Laboratory of Photoelectric Control on Surface and Interface, College of Science, Hebei University of Science and Technology, Shijiazhuang, 050018, China.
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Tamayo L, Melo F, Caballero L, Hamm E, Díaz M, Leal MS, Guiliani N, Urzúa MD. Does Bacterial Elasticity Affect Adhesion to Polymer Fibers? ACS APPLIED MATERIALS & INTERFACES 2020; 12:14507-14517. [PMID: 32118396 DOI: 10.1021/acsami.9b21060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The factors governing bacterial adhesion to substrates with different topographies are still not fully identified. The present work seeks to elucidate for the first time and with quantitative data the roles of bacterial elasticity and shape and substrate topography in bacterial adhesion. With this aim, populations of three bacterial species, P. aeruginosa DSM 22644, B. subtilis DSM 10, and S. aureus DSM 20231 adhered on flat substrates covered with electrospun polycaprolactone fibers of different diameters ranging from 0.4 to 5.5 μm are counted. Populations of bacterial cells are classified according to the preferred binding sites of the bacteria to the substrate. The colloidal probe technique was used to assess the stiffness of the bacteria and bacteria-polymer surface adhesion energy. A theoretical model is developed to interpret the observed populations in terms of a balance between stiffness and adhesion energy of the bacteria. The model, which also incorporates the radius of the fiber and the size and shape of the bacteria, predicts increased adhesion for a low level of stiffness and for a larger number of available bacteria-fiber contact points. Te adhesive propensity of bacteria depends in a nontrivial way on the radius of the fibers due to the random arrangement of fibers.
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Affiliation(s)
- Laura Tamayo
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras, Santiago 3425, Chile
| | - Francisco Melo
- Departamento Física, Facultad de Ciencia, Universidad de Santiago de Chile, Avenida Ecuador, Santiago 3493, Chile
- Center for Soft Matter Research, SMAT-C, Avenida Libertador Bernardo O'Higgins, Santiago 3363, Chile
| | - Leonardo Caballero
- Departamento Física, Facultad de Ciencia, Universidad de Santiago de Chile, Avenida Ecuador, Santiago 3493, Chile
- Center for Soft Matter Research, SMAT-C, Avenida Libertador Bernardo O'Higgins, Santiago 3363, Chile
| | - Eugenio Hamm
- Departamento Física, Facultad de Ciencia, Universidad de Santiago de Chile, Avenida Ecuador, Santiago 3493, Chile
| | - M Díaz
- Laboratorio de Comunicación Bacteriana, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras, Ñuñoa, Santiago 3425, Chile
| | - M S Leal
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras, Santiago 3425, Chile
| | - N Guiliani
- Laboratorio de Comunicación Bacteriana, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras, Ñuñoa, Santiago 3425, Chile
| | - M D Urzúa
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Las Palmeras, Santiago 3425, Chile
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Xu R, Wei D, Du B, Cao W, Fan D, Zhang Y, wei Q, Ju H. A photoelectrochemical sensor for highly sensitive detection of amyloid beta based on sensitization of Mn:CdSe to Bi2WO6/CdS. Biosens Bioelectron 2018; 122:37-42. [DOI: 10.1016/j.bios.2018.09.030] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 09/07/2018] [Accepted: 09/08/2018] [Indexed: 01/04/2023]
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Wolf SLP, Caballero L, Melo F, Cölfen H. Gel-Like Calcium Carbonate Precursors Observed by in situ AFM. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:158-163. [PMID: 27992206 DOI: 10.1021/acs.langmuir.6b03974] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The debate about crystallization processes is still ongoing and nonclassical crystallization mechanisms attract more and more attention. This work indicates that polymer induced liquid precursor (PILP) phases play a role for nonclassical calcium carbonate crystallization and growth processes. Here we report the observation of gel-like precursors for the crystal growth on a calcite surface by means of an in situ AFM study. These precursors spread out on the surface with time supporting their liquid character. This study will give new insights into biomineralization and crystallization processes in general.
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Affiliation(s)
- Stefan L P Wolf
- Physical Chemistry, University of Konstanz , 78457 Konstanz, Germany
| | - Leonardo Caballero
- Departamento de Física, Universidad de Santiago de Chile , Avenida Ecuador 3493, Estación Central 9170124, Casilla 307, Correo 2, Santiago, Chile
| | - Francisco Melo
- Departamento de Física, Universidad de Santiago de Chile , Avenida Ecuador 3493, Estación Central 9170124, Casilla 307, Correo 2, Santiago, Chile
| | - Helmut Cölfen
- Physical Chemistry, University of Konstanz , 78457 Konstanz, Germany
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